Abstract
Disinfection of bacteria in water with sustainable and energy-efficient methods is still a great challenge. Herein, a novel gelatin sponge with embedded AgNPs is fabricated via freeze-drying using gelatin as the reducing agent to synthesize AgNPs in situ. UV-vis spectroscopy, HRTEM, XRD, and XPS characterization prove the formation of AgNPs with an average size of 8.55 ± 0.35 nm. TEM and SEM images confirm the even distribution of AgNPs throughout the AgNPs/gelatin sponges. The composite sponge has a low bulk density of 20 ± 3.5 mg/cm3 and a pore size of 6.2 ± 1.5 μm. The AgNPs/gelatin sponges exhibit excellent antibacterial performance to E. coli in water, probably by destroying their cell membranes. The porous AgNPs/gelatin composite sponges are promising filter materials for water disinfection. The removal rate of AgNPs/gelatin composite sponges on E. coli reached almost 100%.
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Funding
This work was supported by the National Key Research and Development Program of China (2016YFC0401104), HIT Environment and Ecology Innovation Special Funds (HSCJ201617), the National Natural Science Foundation of China (Grant No. 21773050, 21528501), and State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) (No. 2017DX05).
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Responsible editor: Angeles Blanco
Synopsis
AgNPs/gelatin composite sponge filters, prepared by a low-cost and green synthesis, exhibit excellent disinfection capabilities.
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Wei, F., Zhao, X., Li, C. et al. A novel strategy for water disinfection with a AgNPs/gelatin sponge filter. Environ Sci Pollut Res 25, 19480–19487 (2018). https://doi.org/10.1007/s11356-018-2157-1
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DOI: https://doi.org/10.1007/s11356-018-2157-1